Nikon Reviews

My copy of this lens gives good image quality, though it does have slight barrel distortion (things near the edge of the field of view bulge out very slightly). This is typical for this wide of a lens, and isn't noticeable unless viewing something with lots of straight lines near and parallel to the edge of the frame.
I like the lens, but do make sure you really want a lens with a field of view THIS WIDE. It's nice for landscapes, but they will all have everything but the kitchen sink in each shot. You can't use this lens to isolate a particular feature of interest like you can with a standard or a telephoto lens.
One feature nobody seems to pay much attention to on this lens is that it can focus very close! You can do a sort of wide-angle macro work with this lens, if the light is good.
I recommend it as a relatively affordable alternative to the Canon or Tamron equivalents, if you are sure a 14mm lens is something you really want. I like mine, but occasionally have second thoughts about needing a lens this wide. Finally, I should mention that I use a digital SLR which only uses the central 2/3 of the lens. I've seen reports from others saying that edge distortion on this lens is unacceptable with a full-frame film camera.

To echo what is said about the new release SIGMA lenses - WOW.

Canon look out. I was shopping for a new toy for XMAS and settled on the CANON 14mm F2.8L lens. It was very nice but for the price hard to justify. I asked for an eval of the Canon and this, the Sigma alternative at 1/3rd the price. Head to head testing of the lenses on my Canon EOS 50 (ELAN) using ISO 200 film resulted in the Sigma producing a crisper image with better definition and colour saturation. Both lenses have a little "flattening" of the image at the edges as they try to compensate for curvature but the Sigma in my opinion is closer to true. Neither lens had any trouble Auto-Focusing during the day (Canon felt a little faster). The Sigma was a little unsure of itself on when I went for a night/bulb exposure of the starscape. Switched to Manual, set for infinity and away we went. My only other issue with the Sigma is the lens hood is not quite big enough where the Canon is spot on. Still you have to be looking really hard for faults to find them.

Tooling around with the lens has been lots of fun. I had never considered using the lens for indoors shots but it is magic. Architecture photography is going to be a new thing for me I think.

This 105mm Sigma macro lens with a fast f/2.8 aperture satisfies you in every department. First of all it gives you a 1:1 true life size macro and these macro images comes out truly amazing... extremely sharp, good color saturation and contrast(on Pentax ZX-7). The 105mm focal length is also suitable for taking portraits. Portrait results have also come out extremely well. The EX finish is aesthetically pleasing, scratch proof and has a metal alloy body for sturdiness. The hood which is provided along with the lens matches well with it. One can also use a 77mm dia lens cap which fits perfectly on the hood, so that the hood can remain permanently on the lens (hood is threaded so that it can screw on the lens like filters.)

A bit of a bother is the clutch mechanism which on has to engage/disengage while changing between MF/AF. But on the positive side, the focus ring doesn't move (in AF mode) and one is more at ease while holding the camera. The other thing is the long rotational travel of the focusing ring while focusing a subject and in AF mode this could sometimes take a while. This could be somewhat solved by using the focusing limiter switch.

Definitely, a well made lens optically and structurally and should satisfy one and all.

I bought this lens when they had a sale. It was [price] without shipping charge, and I think the price was the lowest anywhere.
I love this lens. It is a lot sharper than EF 28-135mm IS, which I use most of the time. Now I can take good pictures of teeth from my patients and also good portraits for my baby.
Overall it is very versatile and overall quality is excellent, and I would recommend to anyone interested in macro photography.

Sigma 105 EX macro is considered one of the best primes for its optical quality. MTF tests, which determine how sharp the lens is, place it just below the famous Canon 100mm Macro. The EX sign tells that the build quality of the lens is higher than that of a consumer-grade product. The big plus is a price. It is almost twice cheaper than Canon 100mm. ALso, it comes with the case and a hood and Canon does not. The drawbacks, however, include potential incompatibility with the future Canon camera bodies. I would highly recommend this lens for advanced amatures on a tight budget.

Works wonderfully with my Sigma 70-200 f/2.8 HSM. Fast, very sharp. Seems to be very well made. A great addition to any fast Sigma lenses.

I use this converter on my Sigma 70-200 f/2.8 HSM Nikon mount. I used it first last fall at the Petit Le Mans at Road Atlanta and was very impressed with the results. Aperture is reduced to f/4, which is still a bright finder, and autofocus operation is not negatively effected. All electronic functions such as HSM and D coupling still work. Very sharp from my experience.